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Study of 3 Monoclonal Antibodies (REGN9933, REGN7508, and REGN9533) in Adult Participants With End-Stage Kidney Disease on Hemodialysis

A Master Protocol for a Phase 1b Double-Blind, Randomized Study to Assess the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of REGN9933 and REGN7508, Factor XI Monoclonal Antibodies, and REGN9533, a Factor XII Monoclonal Antibody, in Participants With End-Stage Kidney Disease on Hemodialysis

Status
Not yet recruiting
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07759167
Enrollment
36
Registered
2026-08-12
Start date
2026-09-09
Completion date
2027-03-25
Last updated
2026-08-12

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

End-Stage Kidney Disease (ESKD)

Keywords

Hemodialysis (HD), Thrombosis, Bleeding, Blood clots, Chronic Kidney Disease (CKD)

Brief summary

This study will evaluate three Investigational Medicinal Products (IMPs) called REGN9933, REGN7508, and REGN9533. The study is focused on participants with End-Stage Kidney Disease (ESKD) treated with hemodialysis and standard anticoagulant treatment, such as heparin, to reduce the risk of blood clots as they can lead to serious health problems or be life-threatening. Because participants with ESKD who have hemodialysis have a higher risk of bleeding, the IMPs could be a meaningful new therapeutic option. The main aim of the study is to see what side effects may happen from taking REGN9933, REGN7508, or REGN9533. The study is looking at several other research questions, including: * How much IMP is in the blood at different times and * If the IMPs affect the ability of the blood to clot normally

Interventions

Administered per the protocol

Administered per the protocol

Administered per the protocol

DRUGHeparin

Administered per the protocol

Sponsors

Regeneron Pharmaceuticals
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

Key Inclusion Criteria: 1. Has ESKD and has regular adherence receiving HD 3 times per week as described in the protocol 2. Is receiving heparin (standard of care) anticoagulation, with no history of intolerability, during each dialysis session 3. Has adequate vascular access 4. Is clinically stable with no hospitalizations in the past 30 days prior to first screening visit as described in the protocol Key

Exclusion criteria

1. Has history of major bleeding (International Society on Thrombosis and Haemostasis \[ISTH\]) criteria) within the past 3 months prior to the first screening visit as described in the protocol 2. Has known bleeding conditions (eg, Hemophilia A, B or C, von Willebrand's disease) hemorrhagic tumor sites, or other conditions with a high risk for bleeding (eg, hepatic disease associated with coagulopathy) 3. Current use of oral anticoagulants (eg, warfarin, Direct Oral Anti-Coagulant \[DOACs\]) or dual antiplatelet therapy for clinical indication 4. Heart failure as classified by New York Heart Association (NYHA) class III or IV 5. Has a sustained uncontrolled hypertension as described in the protocol Note: Other protocol-defined Inclusion/

Design outcomes

Primary

MeasureTime frame
Occurrence of Treatment-Emergent Adverse Events (TEAEs)Up to approximately 78 days
Severity of TEAEsUp to approximately 78 days

Secondary

MeasureTime frame
Concentrations of REGN9933Up to approximately 78 days
Concentrations of REGN7508Up to approximately 78 days
Concentrations of REGN9533Up to approximately 78 days
Change in activated Partial Thromboplastin Time (aPTT)From baseline up to approximately 78 days
Change in Prothrombin Time (PT)From baseline up to approximately 78 days

Contacts

CONTACTClinical Trials Administrator
clinicaltrials@regeneron.com844-734-6643
STUDY_DIRECTORClinical Trial Management

Regeneron Pharmaceuticals

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Aug 13, 2026